If 1 cylinder has no compression and 2 other have low.. My guess is vales. Most vale jobs on a 4 cylinder in my area is about $1500.00.... A cylinder leak down test will 95% of the time will tell you where the problem is.. Was it good on oil before the problem? Is the body in good shape? $1500 is way better than 15k or more.. Funny I have a 1995 ford escort that I got years back with bad vales.. I paid,, Yes $125 bucks for it and it had 130k... Did a vale job and it now has just turned 300k miles.. Everyone thought I was nuts when I got the trans rebuilt about 2 years ago at 245k..
If I get,, hopefully next winter (2016) and than summer out of it, it should have 350-360k on it..